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Button(
  modifier = Modifier.testTag("First Button"),
  onClick = clickListener) {
    Text("Push first destination")
}

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android {
  testOptions {
    unitTests {
      includeAndroidResources = true
    }
  }
}

dependencies {
  testImplementation 'junit:junit:4.+'

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@RunWith(AndroidJUnit4::class) // Update: back in 2022, this used to be @RunWith(RobolectricTestRunner::class)
class MyTests {                         
  
  @get:Rule val composeTestRule = createComposeRule()                         
  
  @Test fun `when I test, then it works`() {
    // Some test code here
  }
}

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class MainApplication : Application() {

    private val createdActivities = mutableListOf<WeakReference<Activity>>()

    override fun onCreate() {
        super.onCreate()
        registerActivityLifecycleCallbacks(activityLifecycleCallbacks())
    }

    fun closeAllActivities() {

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@Before
@Throws(Exception::class)
fun setUp() {
    ShadowLog.stream = System.out // Redirect Logcat to console
}

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Note that the file lives in the package as Picasso (src/androidTest/java/com/squareup/picasso). Otherwise we don't have access to targetToAction

package com.squareup.picasso;

import android.app.Activity;
import android.os.Handler;
import android.support.test.espresso.IdlingResource;
import android.support.test.runner.lifecycle.ActivityLifecycleCallback;
import android.support.test.runner.lifecycle.Stage;

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class MyCustomView : View {
  constructor(context: Context) : super(context)
  constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
  constructor(context: Context, attrs: AttributeSet?, attributeSetId: Int) : super(context, attrs, attributeSetId)
}

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"button": {
  "title": "Create your first playlist",
  "action": {
    "type": "command",
    "url": "/command/endpoint?path=%2Fcommand%2Fcreate-playlist",
    "prompt": {
      "type": "textInput",
      "message": "Give your playlist a name.",
      "placeholder": "My first playlist",
      "confirmButtonTitle": "Create"

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// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override

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import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,